Define the law of superposition

The law of superposition states that the oldest rocks in a stratigraphic sequence will be at the bottom, and age of each layer decreases as you move upwards (I.e. a layer in a sequence cannot be younger than one above it). This assumes that the sequence is still the right way up, and that none of the layers intruded after the sequence was deposited.

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Answered by Henry H. Geology tutor

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